Jennifer

1. Download Adobe PDF IFilter 6.0
2. Stop the IIS Admin service: Start -> Run -> services.msc -> IIS Admin Service -> Stop
3. Run the Adobe PDF IFilter 6.0 Setup program to install the filter on the server.
4. Copy the ICPDF.GIF file to "C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\12\Template\Images"
5. Edit the file C:\Program Files\Common Files\Microsoft Shared\Web server extensions\60\Template\Xml\DOCICON.XML
   1. Add an entry for the .pdf extension.
      <Mapping Key="pdf" Value="icpdf.gif"/>
6. Perform an iisreset or recycle the SharePoint Application Pools
7. Add the .pdf file type to the index list:
8. Go to Central Administration, then to the Shared Services Administration Web of the current SSP, go to Search Settings and next to File Type
9. Add a new file type pdf
10. Perform a Full Update on the Search content indexes

I got this information from:  http://www.sharepointblogs.com/vandest/archive/2006/11/23/16325.aspx